Take a "multi-meter" and measure both the voltage and amperage output from the AC adapter, and compare with the specifications on the label on the adapter.

Open the enclosure, and remove the disk-drive, and then connect it as a "slave" disk-drive in a desktop computer, to see if it works at all.

Purchase a new, compatible, disk-drive, and install it in the enclosure, to "revive" your external storage device.

Get the part-number and serial-number from the label on your disk-drive, and access the manufacturer's web-site, and use "check warranty status", to see if they will replace the device, at minimal cost to you.

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first of all you should try it on deferent pc , if its ok then that leads us to insufficient power provided through usb ports , try using back usb ports not the ON-front, and if the problem still try using dual-usb cable like thishttp://www.cooldrives.com/usb-power-cable-mini-b.htmland if the external hdd doesn't work at all it might be the usb controller board inside the hdd cage needs to be changedif you cant find a similar one you may buy a new empty cage

If the data is absolutley critical and very valuable, you can send it to Seagate and they are very good at recovery as well. It gets a little pricey at $800, but I too have had to use that as well for mission critical data I could not afford to lose.

First check if other usb data drive like is pen drive is getting detected. Check all the usb ports. Check the Seagate drive with other computer if you have.Restart the system in safe mode and check.Try to create new admin account and check .If also chck the usb cable to make user it is not defective. If nothing works probably your hdd is gone bad. Good luck.

Click on the link below and then click on the "Fixit" button. Windows has a patch for all external devices not recognized by PC's including HD's. This is especially an issue for those who've recently installed SP3. Best of luck with your problem.
Greg

The disk is either damaged or the USB interface is damaged.1) You could try opening the external case and connect the disk to your computer directly (Using IDE/S-ATA cables)2) Format the HD and use data recovery software/service.